Empididae. 103 



somewhat short, the basal joints short, of about equal length, the thlrd 

 joint not long. Dorsocentral and acrostichal bristles biserial, the latter 



Fig. 36. Antenna of E. vitripennis. x 100. 



sometimes absent (e. g. hyalipennis). One stronger and some weaker 

 humeral bristles, a posthumeral, one to some notopleural, a supraalar 

 and a postalar bristle. Metapleural bristles numerous. Scutellum with 

 two to four bristles. Abdomen vvithout bristles. Male genitalia small 

 or larger. Legs with bristles; hind legs somewhat elongated; front 

 and hind metatarsi in the male more or less thickened. Posterior, or 

 only hind legs in the female compressed and pennate. Wings with 

 the axillary lobe well developed and the axillary angle acute; the 

 upper branch of the discai vein abbreviated, and generally also the 

 anal vein; discai cell not pointed; cubital vein terrainating a the apex. 



Tahle of Species. 



1. No acrostichal bristles; thoi-acic and scutellar bristles 

 yellow, the latter four in number; anal vein reaching 



the margin 10. hyalipennis. 



— Acrostichal bristles present; thoracic and scutellar bristles 

 black ; the latter two in number ; anal vein abbreviated ... 2. 



2. Halteres and metapleural bristles pale yellow 11. albinervis. 



— Halteres and metapleural bristles black 12. vitripennis. 



10. E. hyalipennis Fall. 



1815. Fall. Dipt. Suec. Empid. 21, 10. — 1822. Meig. Syst. Beschr. 

 III, 24, 14. — 1842. Zett. Dipt. Scand. I, 385, 19. — 1862. Schin. F. A. 

 I, 106. p. p. — 1893. Strobl. Mitth. Ver. Steierm. 1892. 73. — 1903. 

 Kat. palåarkt. Dipt. II, 238. 



Male. Eyes contiguous; epistoma dark grey. Occiput grey, with 

 more or less pale hairs. Labrum ferruginous or brown, very long 

 and thin, more than twice as long as the head is high. Antennæ 

 relatively long, about of the length of the head, black, the third joint 

 elongated; the style somewhat long. Thorax grey, unstriped, viewed 

 from in front more blackish and shining; the humeral point brown 

 or reddish. The dorsocentral bristles somewhat long, biserial, longer 

 and uniserial behind, yellow; no acrostichal bristles. Further one 

 stronger and some a little weaker humeral bristles, a posthumeral, 

 about three notopleural, a supraalar and a postalar bristle, all yellow. 



